单项选择题

Both English and Chinese ______ at the meeting yesterday.

A．used
B．are used
C．were used
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单项选择题
He ______ in China for ten years.
A．lived
B．lives
C．has lived
单项选择题
He didn't catch the late bus, ______ he had to walk home.
A．so
B．because
C．but
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